FIFO is limited to 64 bytes yet MCU is capable of transmitting
larger packets provided that FIFO will be filled on the fly
and USB_USB_TXCx_REG_USB_LAST_Msk bit is set after FIFO is
filled with all the data that should be transmitted.
This change allows to use FIFO level warning interrupt to fill
FIFO. When DMA is available it will be used instead of interrupts.
Some function names were changed to better reflect what each function
does.
Closing endpoints can be important when there are alternate
instances. This adds functionality of closing endpoints
similar to what exists in other drivers.
Internal FIFO for each endpoint is limited to 64 bytes.
It is possible to have longer packets if respective FIFO
is read during actual packet transmission.
This change updates receive data path to allow packets (and
endpoint size) larger then 64 bytes.
If DMA is not used yet DMA is setup for reception of big packets.
If DMA is already assigned to some transfer, code enables FIFO level
warning interrupts and tries to read data before FIFO is filled up.
Operator < used in while condition was obviously incorrect.
Loop starts with checking if unsigned variable is less then 0.
This condition is always false.
This reverses condition to follow intention of of the code.
Fix a bug in writing SysEx messages.
At the start of a new USB packet (4 bytes), while in the middle of a SysEx, the code mistakenly
set the buffer length to 4, not the target length. As a consequence, the 3rd and 4th bytes from
the last packet were included, after every byte of the SysEx after the first packet of three.
The fix is simple, as it was just a typo, as can bee seen from the other branches in the same
section of if/else statements: At the start of a new packet, the code should set up the target
length... the buffer length should be left at 2 (as set on line 180).
define __USE_CMSIS instead of __USE_LPCOPEN will have startup enable FPU
on startup properly. Although it is only relevant to lpx43/40 series,
change all to __USE_CMSIS for consistency
